Click on Media Server under USB Storage. If you have a newer router with the genie UI, click on the ADVANCED tab then choose Media Server under USB Storage.

Check the Enable Media Server box to enable the Media server

The Content Scan option.

Automatic (when new files added) will automatically scan whenever a new file is added to the USB Drive

Scheduled Scan: This will allow you schedule a scan once in a defined time frame

Scan Now: You can scan immediately for any new media.

Click on Apply button to save the changes

In case of any query, please contact Netgear router support company on toll free number at 1-888-479-2017. You can also write to them or chat with the Netgear tech support representatives via web chat.